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Mounted through a wall, this transmitter measures relative humidity in room air to ±3% accuracy using a thermoset polymer capacitive element behind a hydrophobic filter. A matched 10,000 ohm Type III thermistor shares the housing, so humidity and temperature reach the controller from one enclosure. Field-selectable outputs cover 0-5 and 0-10 V DC and 4-20 mA.
Mounted through a wall, this transmitter measures relative humidity in room air to ±3% accuracy using a thermoset polymer capacitive element behind a hydrophobic filter. A matched 10,000 ohm Type III thermistor shares the housing, so humidity and temperature reach the controller from one enclosure. Field-selectable outputs cover 0-5 and 0-10 V DC and 4-20 mA.
The ACI Relative Humidity with Thermistor Room Series utilizes a thermoset polymer capacitive sensing element with a factory fitted hydrophobic filter to improve its moisture resistance. The sensing elements multilayer construction also provides excellent resistance in applications where dust, dirt, oils and common environmental chemicals are found. The RH room sensors include on board DIP switches which allow the user to select the desired output signal and can be powered by AC or DC power sources. Single point field calibration can be performed by using the increment and decrement calibration DIP switches to adjust your curve up or down in +/- 0.5% increments with each toggle of the corresponding switches.
Features
Applications
| RH Measurement Range | 0 to 100% |
| RH Accuracy @ 77°F (25°C) | ± 1% over 20% RH Range between 20 to 90% | ± 2%, or 3% from 10 to 95% |
| RH Stability | Repeatability | Sensitivity | Less than 2% drift / 5 years | 0.5% RH | 0.1% RH |
| Thermistor Accuracy 32 to 158°F (0 to 70°C) | ± 0.36°F (0.2°C) |
| RH Output Load Resistance | 4 to 20 mA: 700 Ohms maximum | 0 to 5 V DC or 0 to 10 V DC: 4K Ohms Minimum |
| RH Output Signal | 2-wire: 4 to 20 mA (Factory Default) | 3-wire: 0 to 5 or 0 to 10 V DC and 4 to 20 mA (Field Selectable) |
| RH Response Time (T63) | 20 Seconds Typical |
| RH Transmitter Stabilization Time | 30 Minutes (Recommended time before doing accuracy verification) |
| Thermistor Sensor Response Time (T63) | 10 Seconds nominal |
| RH Supply Current (VA) | Voltage Output: 8 mA maximum (0.32 VA) | Current Output: 24 mA maximum (0.83 VA) |
| RH Supply Voltage (Reverse Polarity Protected) | 0 to 5 V DC: 12 to 40 V DC / 18 to 28 V AC | 0 to 10 V DC: 18 to 40 V DC / 18 to 28 V AC |
| Thermistor Power Dissipation Constant | 3 mW/°C |
| RH Sensor Type | Capacitive with Hydrophobic Filter |
| RH Connections | Wire Size | Screw Terminal Blocks (Polarity Sensitive) | 16 (1.31 mm2) to 26 AWG (0.129 mm2) |
| RH Terminal Block Torque Rating | 4.43 to 5.31 lb-in (0.5 to 0.6 Nm) |
| Temperature Connections | Wire Size | Screw Terminal Blocks | 16 (1.31 mm2) to 26 AWG (0.129 mm2) |
| Temperature Terminal Block Torque Rating | 4.43 to 5.31 lb-in (0.5 to 0.6 Nm) |
| Operating RH Range | 0 to 95% RH, non-condensing |
| Operating Temperature Range | 35 to 122°F (1.5 to 60°C) |
| Storage Temperature Range | -40 to 149°F (-40 to 65°C) |
| Enclosure Flammability Rating | UL94-HB "-R2" Enclosure: 4.50" (114.3 mm) x 2.75" (69.85 mm) x 1.12" (28.45 mm) |
| Enclosure Material (Color) | "-R2" Enclosure: ABS (White) | "-R" Enclosure: ABS (Beige) |
| Product Dimensions (L x W x H) | 4.45 x 2.70 x 1.10" (113.0 x 68.6 x 27.9 mm) |
| Product Weight | 0.14 lbs (66 g) |
| Agency Approvals | CE, UKCA, RoHS, WEEE |
| RH Measurement Range | 0 to 100% |
| RH Accuracy @ 77°F (25°C) | ± 1% over 20% RH Range between 20 to 90% | ± 2%, or 3% from 10 to 95% |
| RH Stability | Repeatability | Sensitivity | Less than 2% drift / 5 years | 0.5% RH | 0.1% RH |
| Thermistor Accuracy 32 to 158°F (0 to 70°C) | ± 0.36°F (0.2°C) |
| RH Output Load Resistance | 4 to 20 mA: 700 Ohms maximum | 0 to 5 V DC or 0 to 10 V DC: 4K Ohms Minimum |
| RH Output Signal | 2-wire: 4 to 20 mA (Factory Default) | 3-wire: 0 to 5 or 0 to 10 V DC and 4 to 20 mA (Field Selectable) |
| RH Response Time (T63) | 20 Seconds Typical |
| RH Transmitter Stabilization Time | 30 Minutes (Recommended time before doing accuracy verification) |
| Thermistor Sensor Response Time (T63) | 10 Seconds nominal |
| RH Supply Current (VA) | Voltage Output: 8 mA maximum (0.32 VA) | Current Output: 24 mA maximum (0.83 VA) |
| RH Supply Voltage (Reverse Polarity Protected) | 0 to 5 V DC: 12 to 40 V DC / 18 to 28 V AC | 0 to 10 V DC: 18 to 40 V DC / 18 to 28 V AC |
| Thermistor Power Dissipation Constant | 3 mW/°C |
| RH Sensor Type | Capacitive with Hydrophobic Filter |
| RH Connections | Wire Size | Screw Terminal Blocks (Polarity Sensitive) | 16 (1.31 mm2) to 26 AWG (0.129 mm2) |
| RH Terminal Block Torque Rating | 4.43 to 5.31 lb-in (0.5 to 0.6 Nm) |
| Temperature Connections | Wire Size | Screw Terminal Blocks | 16 (1.31 mm2) to 26 AWG (0.129 mm2) |
| Temperature Terminal Block Torque Rating | 4.43 to 5.31 lb-in (0.5 to 0.6 Nm) |
| Operating RH Range | 0 to 95% RH, non-condensing |
| Operating Temperature Range | 35 to 122°F (1.5 to 60°C) |
| Storage Temperature Range | -40 to 149°F (-40 to 65°C) |
| Enclosure Flammability Rating | UL94-HB "-R2" Enclosure: 4.50" (114.3 mm) x 2.75" (69.85 mm) x 1.12" (28.45 mm) |
| Enclosure Material (Color) | "-R2" Enclosure: ABS (White) | "-R" Enclosure: ABS (Beige) |
| Product Dimensions (L x W x H) | 4.45 x 2.70 x 1.10" (113.0 x 68.6 x 27.9 mm) |
| Product Weight | 0.14 lbs (66 g) |
| Agency Approvals | CE, UKCA, RoHS, WEEE |
